Fedorenko Elena, Tretyakova Galina, Mirochnik Anatolii, Gerasimenko Andrey, Beloliptsev Anton
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences Department, Prosp. 100 letiya Vladivostoka, 159, Vladivostok, Russian Federation.
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences Department, Prosp. 100 letiya Vladivostoka, 159, Vladivostok, Russian Federation; Far Eastern Federal University FEFU Campus, 10 Ajax Bay, Russky Island Vladivostok, Russian Federation.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Dec 5;262:120114. doi: 10.1016/j.saa.2021.120114. Epub 2021 Jun 29.
A comparative study of the luminescence properties and crystal structure of boron difluoride 1-(anthracen-9-yl)butane-1,3-dionate (1) and their nitrogen-containing analogs with hydrogen and methyl substituents (2 and 3) has been performed. For boron difluoride beta-diketonate (1) and beta-ketoiminate with a hydrogen substituent (2), which does not create significant steric difficulties, the luminescence of crystals is determined by that of excimers and aggregates based on them. For the compounds 1-3, mechanofluorochromism has been observed, the spectral manifestation of which is different: at grinding the crystals of 1 and 2, a hypsochromic shift of the excitation and luminescence bands occurs, whereas in the case of crystals of 3, a bathochromic shift takes place. Dual luminescence has been detected for the solutions of 1. During the relaxation in the excited state of a molecule of 1 (S → S'), TICT is formed. It was possible to register the short-wavelength luminescence from the LE state in the dilute solutions of 1. TICT or LE luminescence can be excited, in the case of 1, by varying the wavelength of the exciting light.
对二氟化硼1-(蒽-9-基)丁烷-1,3-二酮(1)及其含氢和甲基取代基的含氮类似物(2和3)的发光性质和晶体结构进行了比较研究。对于二氟化硼β-二酮(1)和带有氢取代基的β-酮亚胺(2)，由于其不会产生显著的空间位阻，晶体的发光由基于它们的准分子和聚集体的发光决定。对于化合物1-3，观察到了机械致荧光变色现象，其光谱表现各不相同：研磨1和2的晶体时，激发带和发光带发生蓝移，而对于3的晶体，则发生红移。在1的溶液中检测到了双重发光。在1的分子激发态弛豫过程中(S→S')，形成了扭转分子内电荷转移(TICT)。在1的稀溶液中，可以记录到来自局域激发(LE)态的短波长发光。对于1，通过改变激发光的波长可以激发TICT或LE发光。
